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The #385A combines many of the necessary features required for today's automotive diagnostics. For example: use the frequency readings to test crankshaft and camshaft sensors. Or, use the duty cycle setting to test feedback carburetors and idle air control motors. The #385A can test just about any electrical signal on the vehicle. This high impedance meter (10 Meg/Ohm) will not overload sensitive on-board computers and sensors. The #385A comes equipped with an RPM clamp, probe test leads, alligator clip test leads, protective holster, instructions and installed 9 volt battery.